Product Description:

The KDA 2.1-150-3-DQD-W1 is a spindle drive developed by Bosch Rexroth Indramat within the KDA Spindle Drives series. In an automation cell, the unit converts rectified DC-bus power from the cabinet into controlled three-phase output for high-speed machine-tool spindles. This allows precise torque and speed regulation during drilling, milling, and grinding operations. The controlled output helps maintain spindle performance during rapid speed changes and varying cutting loads.

The drive delivers a continuous output current of 150 A, which is the maximum line current the power stage can supply without thermal derating. Its internal DC bus operates from a constant 300 VDC source, so the connected power supply must provide a stabilized DC level. Thermal management uses a mounted heatsink blower, and heat removal is supported by forced cooling so the power semiconductors remain cooled even at low motor speeds. This cooling method supports continuous spindle operation when airflow cannot depend on motor shaft speed. The blower motor is supplied by an auxiliary line of 220 V/50-60 Hz, which must be routed separately from the main DC conductors so the ventilation circuit remains active whenever the cabinet is energized. Separate blower power also helps keep thermal conditions consistent during idle periods between machining cycles.

The permissible operating temperature range is 5 to 45 °C. At elevations up to 1000 m above sea level, the cooling system can remove enough heat for normal operation, while higher altitudes require derating. Speed commands are transmitted through a parallel bus with a digital 16-bit parallel value, allowing fine setpoint resolution for contouring tasks. A separate interface accepts a digital position command value, so the same drive can be used for position-control applications when paired with suitable axis feedback devices. The control architecture supports precise command updates for machining paths that require repeatable response.